First, investigate the power supply voltage of the place where the electricity is used, the actual electricity load of the user and the conditions of the place, and then select one by one according to the technical data marked on the nameplate of the transformer. How to determine the reasonable capacity of the transformer?
Generally, the transformer capacity, voltage, current and environmental conditions should be considered comprehensively. The capacity selection should be based on the capacity, nature and use time of the user's electrical equipment to determine the required load, so as to select the transformer capacity.
During normal operation, the electrical load on the transformer should be about 75 to 90% of the transformer's rated capacity. In operation, when the actual load of the transformer is less than 50%, the small-capacity transformer should be replaced. If it is greater than the rated capacity of the transformer, the large transformer should be replaced immediately. At the same time, when selecting the transformer, determine the voltage value of the primary coil of the transformer according to the line power supply, and select the voltage value of the secondary coil according to the electrical equipment. It is best to choose a low-voltage three-phase four-wire system for power supply. This can provide both power and lighting power at the same time.
For the selection of current, attention should be paid to that the load can meet the requirements of the motor when the motor is started.